%
Cause
47.6
Poor workmanship
2.6
Roof traffic
16.7
Poor design
7.8
Trapped moisture
8.0
Materials
8.4
Age & weathering
Potential leak locations include the following:
■
Flashing
■
Drains
■
Penetrations
■
Seams
■
Blisters
28.3.3.2
Safety precautions
■
Recommend a minimum of two people on a roof, preferably three or more.
■
Inspect the underside of the roof for structural integrity prior to walking on it.
■
Avoid stepping on blisters that are common on built up bitumen and gravel roofs.
■
Have a cell phone or radio available in case of emergency.
■
Inform local police and plant security prior to doing nighttime roof survey.
28
Publ. No. 1558550 Rev. a557 – ENGLISH (EN) – October 7, 2011
191
28 – Introduction to building thermography
Summary of Contents for B6 series
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